[hpsdr] 50 Volt 300 watt PA from Russia with IMD3 >= 40 dB

[Helmut, DC6NY]

Hi Sid,

these guys in Russia are very busy and offering a lot of different BP/LP
filters up to 1KW. The design of the split filters is really not bad, but
doesn’t cover frequencies above 30 MHz. You would need at least an external
bypass. 
One BPF covers 6m and can be controlled via 4 open-collector outputs at J16.
I know this fact well because they copied my former proposal of BCD/decimal
decoding and buffering, hi. Moreover not all boards are equipped with an
antenna relay.
Therefore it’s helpful to check the schematics before. That's all what I
want to recommend.

73, Helmut, DC6NY

-----Ursprüngliche Nachricht-----
Von: hpsdr-bounces at lists.openhpsdr.org
[mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von Sid Boyce
Gesendet: Dienstag, 5. November 2013 14:19
An: hpsdr at lists.openhpsdr.org
Betreff: Re: [hpsdr] 50 Volt 300 watt PA from Russia with IMD3 >= 40 dB

***** High Performance Software Defined Radio Discussion List *****

Hi Helmut,
6m RX is covered though I have not got a 6m antenna to check it with.

I thought may be 6m TX was left out because of the PA design limitation, I
didn't know it was verboten in Russia.

cuSDR64's cusdr_alexFilterWidget.cpp defines band filters.

The only reference to band filters for ghpsdr3-alex is in
ghpsdr3-alex/trunk/src/sdr1000/src/linux/hw_sdr1000.cpp so it looks like the
hermes code does nothing with J16.
73 ... Sid.

On 05/11/13 07:54, Helmut, DC6NY wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi guys,
>
> check carefully the actual features of the different EB104.ru designs. 
> Some do not cover 6m, because this band is closed in Russia for hams. 
> BTW a clone of Alex control isn't absolutely necessary. The job can be 
> done also via J16.
>
> 73, Helmut, DC6NY
>
> -----Ursprüngliche Nachricht-----
> Von: hpsdr-bounces at lists.openhpsdr.org 
> [mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von Franz 
> Hegener
> Gesendet: Montag, 4. November 2013 23:09
> An: hpsdr at lists.openhpsdr.org
> Betreff: [hpsdr] 50 Volt 300 watt PA from Russia with IMD3 >= 40 dB
>
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--
Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot Emeritus
IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support Senior Staff
Specialist, Cricket Coach Microsoft Windows Free Zone - Linux used for all
Computing Tasks

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